SQL: “Reverse” transpose a table

Question

I saw a lot of questions on transposing from the below table...

scanid | region | volume
-------------------------
1          A      34.4
1          B      32.1
         


        

Answer 1

You could do this very simply with a UNION clause:

Select Scan_ID, 'A' as Region, A_Volume as volume
    union all
Select Scan_ID, 'B' as Region, B_Volume as volume
    union all
Select Scan_ID, 'C' as Region, C_Volume as volume